brett



(No Model.) 4 3 Sheets-Sheet 1.

E. S. BRETT.

STEAM STAMP. No. 478,393. Patented July 5, 1892.

FIG I FIG 2 (No Model.) 3 SheetS- Sheet 2.

E.S.BRBTT.

STEAM STAMP.

No. 478,393. Patented July 5, 1892.

(No Model.) 3 SheetsSheet 3.

- E. S. BRETT.

STEAM STAMP.

No. 478,393. Patented July 5, 1892.

zinefifiw. f 0% UNITED STATES.

ATENT union.

EDWARD SAMUEL BRETT, OF COVENTRY, ENGLAND.

STEAM-STAM P.

SPECIFICATION forming part of Letters Patent N 0. 478,393, dated July 5, 1892.

Application filed February 26, 1892. fierial No. 422,950. (No mbdel.) Patented in England February 24, 1890, No. 2,924, and April 29, 1891. No. 7,354.

To all whom it may concern.-

Be it known that I, EDWARD SAMUEL BRETT, a subject of the Queen of Great Britain, and a .resident of Coventry, England, have invented new and useful Improvements in Steam-Stamps, (for which I have obtained a patent in Great Britain, No. 2,924, bearing date February 24, 1890, also for part of same 1n Great Britain, No. 7,354, dated April 29, 1891,) of which the following is a specification.

My invention relates to improvements in the construction and arrangement of steamstamps; and its object is to provide in combinatlon therewith a part-rotatingpiston within a circular cylinder; also, to provide facilitics whereby the stamp is raised by means of rotating levers; also, to provide means to lessen the concussion liable upon the return of the lifting-levers also, to provide an arrangement whereby the stamp may be automati cally driven. I effect these improvements by the mechanism illustrated upon the accompanying drawings, in which-- Figure 1 is a general rear view, and Fig. 2 a side View, of this my invention. Fig. 3 is an enlarged detailed rear view, and Fig. 4 is a plan View of the cylinder, valves, and certain other gearing. Fig. 5 is an enlarged end view of the cylinder and valves, showing automatic arrangement. Fig. 6 is an enlarged crosssectlonal view of the cylinder and valves upon line A A, Fig. 4. Fig. 7 is a part sectional detailed view ofthe rotary steam-valve on line 1 1, Fig. 4, showing its position when the cylinder is open to exhaust. Fig. 8 is a front view, and Fig. 9 a side View, of the detached rotary valve. Fig. 10 is an enlarged side View of the loose flexible band-pulley and the lifting-levers. Fig. 11 is a front View, and Fig. 12 a side view in detail, of the bufferplIlS.

Similar numbers refer to similar partsthroughout the several views.

I employ a block 1, pillar-guides 2 2, hammer 3, idle-pulley 4, and flexible band 5 similar to those at present in use.

Upon a suitable base is erected the steamcylinder 6, in which is carried the part-rotating shaft 7. Upon this shaft 7 is formed the plate-piston'S, Fig. 6, to which is given a partrotative movementthat is, through somewhat less than a complete revolution.

9 9 are the lifting-levers, which are secured rigidly to the shaft 7 by cotters 10 or other suitable means, and carrying at their front ends the buffer-pins 11 11 and the cross-bar 12, to which the one end of the flexible band 5 is attached.

13 is a pulley lying between the two liftinglevers and is loose upon the shaft 7. Upon this pulley the band 5 is carried round when the levers 9 9 are rotated. This flexible band 5 is carried thence over the pulley 4 and its other end then connected to the hammer 3.

14 is a part-rotative steam-supply valve, having a steam-port 15,'which communicates on the one side with the steam-supply and on the other side with the interior of the cylinder 6. Thecut-away portion 16 of this valve forms theexhaust-port when the valve has been turned partly round, (see Fig. 7,) so as to out off the supply, and openedto the exhaustoutlet 17.

18 is a second valve, which first controls the supply of steam and is operated by thele- .ver 19, Figs. 3, 4, and 5, its fulcrum being at 20, and is connected to the valve-spindle 21 by joint at 22.

Upon the spindle 23 of the valve14 is fixed the lever 24, whose forward end extends partly across the circular plate 25, which latter is fixed upon the shaft 7, Fig. 5. Upon this plate 25 is secured the striking-piece 26, which, as the piston is rotated, is carried around (in the direction of the arrow shown) and lifts the lever 24 into the position shown in dotted lines, and thereby turns the valve 14 so as to cut off steam and open to exhaust. (See Fig. 7.)

Thus its action is somewhat as follows: Upon the valve 18 being opened to admit steam, as shown in Fig. 6, the steam-passes through to the valve 14, and thence to the cylinder, when the piston is forced around the cylinder 6. With the piston, is rotated the shaft 7, lifting levers9 9, and of course the hammer 3 is raised'by means of the band 5. Also with this movement the circular plate is rotated, when as it proceeds the striking-piece 26 comes in contact with and lifts the lever 2%, and in so doing closes the valve to steam and opens it to exhaust, when the hammer 3 suddenly falls, and in so doing pulls back the piston into its starting position. In this return stroke of the piston the plate 25 is of course carried back with it and the second striking-piece 27 strikes the reverse side of the lever 24 and brings it also back to the position first named, whereby the valve 14 is again opened to steam and closed to exhaust, and thus a repeat action will constantly take place until the valve 18 is again closed. distanced blow of the hammer, by closing the valve 18 to steam and opening to exhaust at any point of the travel of the hammer and before the valve 14 has been opened to ex f the lifting-levers 9 9, thevalve 14, piston 8,

haust, the steam would then exhaust back through the valve-14 and pass below the valve 18 into the exhaust 17 The height to which the hammer may be raised in these continuous strokes may be varied by altering the position of the striking-pieces 26 and 27-as, for instance, various holes 28 or other device may be provided for this purpose. In the sudden fall of the hammer and the consequent sudden return of the levers 9 9 I prevent the too-far motion of the said levers and also prevent the piston striking the rear side of the cylinder by means of the buffer-pins 11 11 coming in contact each With a wooden projection 29, carried upon the block 1, Fig.

2, or other suitable place. These buffer-pins are provided with springs 80 and 31.

' Although I have shown the valve 14 as r otative and the valve 18 as sliding, yet it \Vlll be readily seen that other forms of valves may be adapted; but those shown and described I find to answer best.

What I claim, and desire to secure by Letters Patent, is

1. The combination, in steam-stamps, with the block 1, pillar-guides 2 2, hammer 3, and band 5,0f a cylind er having a part-rotatin g piston S, shaft 7, and levers 9 9, and the operat ing-valves, all substantially as set forth. In case it is desired to give a short- 2. The combination, in steam-stamps, with the cylinder 6, piston 8, valves 14 and 18, and shaft 7, of the lifting-levers 9 9 and loose pulley 13, substantially as described. and shown.

3. The combination, in steam-stamps,with

shaft 7, and the projections 29, of the bufferpins 11 11, substantially as set forth, and for the purposes specified.

4. In steam-stamps, the combination, with the cylinder 6, piston S, and shaft 7,. having thereon the plate 25, with striking-pieces 2b and 27, of the lever 24, carried upon the spin- (110 23 ot the valve 14, substantially as set forth, and for the purpose specified.

EDVARD SAMUEL BRETT.

\Vitnesses:

CHARLES L. POWELL, WILFRID BRAGGE. 

